[Changed] Update README.

README.md

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+# tollwerk extended TYPO3 forms
+
+Extend the native TYPO3 forms for better accessibility, more features and a better user experience.
+
+## Features
+
+* Add better, more accessible client- and server-side validation to all TYPO3 forms
+
+## Supported languages
+
+* English
+* German
+
+## Installation
+
+1. Install the extension with composer.
+    ```
+    composer require tollwerk/tw-forms
+    ```
+
+2. Include the TypoScript template "Tollwerk Enhanced TYPO3 forms (tw_forms)" into your root TypoScript template.
+
+## Disable client-side validation
+
+If you only want to use the server-side validation which supports all validation rules provided by TYPO3, you can use 
+TypoScript to remove the included javascript files:
+
+```typo3_typoscript
+page.includeJSLibs.tw_forms_critical >
+page.includeJSFooter.tw_forms_default >
+```
+
+## Known issues
+
+* The client-side validation only checks the following rules. This will be extended in the future so that all
+validation rules available in the TYPO3 form wizard are taken into account.
+  * required fields
+  * email
+